精力
word B1- energy (physical or mental)
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随着城市生活成本的不断攀升和职场竞争的日益激烈，许多年轻父母不得不将大部分精力投入到事业中。
过去两年的日日夜夜里，我几乎把所有的精力都投入到了枯燥的公式和复杂的演算中。
那些晦涩难懂的传统文献让他觉得枯燥乏味，仿佛无论投入多少精力都无法触及知识的尽头。
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